Why Do We Synchronise Generators?

Introduction

Prolonged power outages are exceedingly uncomfortable and frustrating since electricity is required for so many elements of our daily lives, including the maintenance of our opulent lifestyles. This is why a generator is required to address such issues. Powering particular areas with high demand requires the use of synchronized generators. The usage of synchronized generators increases the overall capacity and reliability of the system. There are several situations in which synchronized generators might be useful.

It might be more cost-effective to employ many smaller units than one large one. Synchronizing the characteristics of one generator with those of another generator, alternator, or bus bar may help restore normal performance. Alternators must have their voltage, frequency, phase angle, phase sequence, and waveform modified so that they can work in tandem with the grid. Generator synchronization, or generator paralleling, describes this procedure. Power may be supplied to a region with high demand by using this method. Therefore, one can conclude that it is very essential to have synchronised generators in some places. 

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Advantages Of Generator Synchronisation

It is highly beneficial to go for the generator synchronisation process. This is because of the following reasons - 

• There would be a need for more room for the system to operate well if the generator rating is greater. It's challenging to maintain command of a single enormous alternator that may generate 1000 MVA or more. Using fewer components and connecting them in parallel reduces the amount of maintenance needed over time.
• The bare minimum of load that you need may change as the day continues. Thanks to the synchronization provided by the generator, the number of active systems in a parallel arrangement may be changed to meet the needs of a load that is either larger or smaller.
• Since the current system would have to be demolished and rebuilt with a larger unit to handle the growth, increasing capacity to meet predicted future demand would be more expensive. Costs may be kept to a minimum by purchasing individual alternator units that are small enough to be installed in combination with the bus bar system. Taking this step will allow you to save cash.
• Using many alternators, rather than a single generator, allows for more reliable parallel operation. When many alternators are connected in parallel, it is possible for the lights to remain on if any one of them fails. In the case that one of your systems fails and has to be fixed, normal operations may likely be maintained by the other systems.
• The efficiency against load graph suggests using the generator at its utmost capacity. The production may be divided into numerous smaller units, enabling us to raise or reduce output as needed, and therefore improving efficiency, in cases when a single big unit would be inefficient.

What To Consider Before Synchronsing A Generator?

There are a lot of factors one needs to consider before synchronising a generator. Some of these are as follows - 

• Having a freestanding generator linked to the grid requires keeping the generator's rotor angle within a tight tolerance of the instantaneous phase angle of the power supply.
• The alternator will only function properly if the phase angle between the bus bar and generator is zero degrees.
• High voltage issues may be precipitated by misaligned alternators and bus bars. When the voltage from the alternator is higher than the voltage from the bus bars, reactive power is at risk in the grid. Because of the low alternator voltage, the generator may fail if it had to absorb an excessive quantity of reactive power from the bus bar.
• When there are incompatible frequency patterns, energy transmission is shaky. This instability may lead to the device's failure.
• Extreme caution must be used during synchronization in order to prevent damage to the generator and the electrical system.
• It is crucial that the alternator's phase sequence matches the phase sequence of the electrical grid or bus bar.
• The voltage and frequency produced by the generator must be identical to those of the distribution system.

What You Need to Know Before Synchronizing Your Generator

When synchronizing the generator, it is imperative that all necessary safety precautions be performed. To protect the generator and electrical system, precise synchronization is necessary. The generator's frequency and voltage must be calibrated appropriately for it to work with the grid. The rotor angle of a standalone generator must be kept within a narrow range of the instantaneous phase angle of the power system in order for the generator to be connected to the grid. In case of an emergency, it is common practice to utilize automatic synchronizers that also allow for manual operation.

Process Of Synchronisation

Paralleling a generator is a complicated procedure. It might take quite some time, and everyone involved in the procedure will need to be highly skilled and cautious. Synchronizing generators is possible via the use of the following methods:

• The generator may be synchronized using the three-dark-lamp approach. Using a bus bar, the second generator in the Three-Dark-Lamps Method may be synchronized with the first.
• By comparing the alternator's frequency to that of the bus bar, the synchroscope approach may be able to determine if the alternator's frequency is greater or lower.
• The Two Bright, One Dark technique may also be used to get a generator in sync. Whether you want to check if the phase sequence is right, this is a nice way to do that.